Fuse for electric circuits



PATENTE D JAN. 19, 1904.

E. C. PHILLIPS; FUSE FOR ELECTRIC CIRCUITS.

APPLICATION FILED JAN. 9, 1903.

10 MODEL.

I j/wood 4 u c v: Nonmi mans co worm mo WASHING) TN Patented January 19,1904.

-UNITED STATES PATENT @FFIQE.

ELWOOD c. @PHILLIPS, or CHICAGO, ILLINOIS.

Fuse FOR ELECTRIC CIRCUITS.

SPECIFICATION forming ,part of Letters Patent No. 750,244, dated January19, 1904.

Application, filed January 9, 1903 To all whon t it party concern:

Be it known that I, ELWooD C. PHILLIPs, a citizen of the United Statesof America, and a resident of Chicago, in-the county of Cook and Stateof Illinois, have invented certain new and useful Improvements in Fusesfor Electric Circuits, of which the following is a specification.

The present invention relates to cut-out fuses employed in electriclighting and like circuits, and has for its object to provide a simpleand efficient fuse-piece-and its surrounding plug adapting the same forready application to an ordinary incandescent-lamp socket and affordingmeans for the ready and convenient replacement of the fuse-piece whenoccasion requires and with which the formation of a sparking connectionbetween the respective terminals is avoided in a simple and eflicientmanner, all as will hereinafter more fully appear and be moreparticularly pointed out in the claim.

In the accompanying drawings, illustrative of the present invention,Figure 1 is a vertical sectional elevation at line a", Fig. 2, of thefuse-piece and its supporting-plug embodying the present improvements;Fig. 2, a plan view of the parts with the cap or cover piece removed;Fig. 3, a plan view of the fuse-piece in a detached condition.

Similar numerals of reference indicate like parts in the diflerentviews.

Referring to the drawings, 1 represents a cylindrical insulating-base,of porcelain or other like insulating material, the outer surface ofwhich is offset, as shown, and provided with upper and lowerscrew-threads 2 and 3 in separated relation and adapted for theindependent attachment of the cap or cover and the conducting-sleeve,hereinafter described.

4 is a sleeve of metal spirally beaded, so as to form interior andexterior screw-threads, and adapted to screw upon the screw-threadedlower end of the base 1 as a permanent part thereof and constitute oneof the contact-terminals of the present fuse-plug. Said sleeve 4: bymeans of its exterior screw-thread is adapted for ready engagement orattachment to the ordinary socket-piece in general use uponelectric-lighting circuits by screwing Serial No. 138,394. (No model.)

into the correspondingly-formed bore of such socket-piece.

5 is a central metal plug fitted into an axial orifice of the base 1 toconstitute the other terminal of the present fuse-block.

\Vith the described arrangement of the sleeve 4 and plug 5 a ready andconvenient electrical connection can be had in the electric circuit towhich it is intended to apply the present fuse, the exterior of thesleeve 4 contacting with a corresponding terminal or contact in thesocket-piece aforesaid, while the plug 5 contacts with a correspondingterminal plug in such socket-piece.

6 is an annular cavity in the upper end of the fuse-base l and which ispartitioned oil from a central cavity 7 in said base by an an nular wallor partition 8, as shown in Figs. 1 and 2.

9 is a horizontal clamp formed by two superimposed plate-shaped jawswhich extend out radially from the central cavity 7 and through a sidepassage in the annular wall or partition 8, their outer ends adapted toengage one end of the curved fuse of the present invention. 1.0 is aclampingscrew passing through said plate-shaped jaws of the clamp 9 andadapted to clamp the jaws thereof firmly upon the curved fuse aforesaid.

11 is a central metal shank connecting the inner end of the clamp 9 withthe plug 5 aforesaid, as shown in Fig. 1.

12 is a longitudinal clamp, also formed by two superimposed plate-shapedjaws,the lower one of which is connected by a vertical extension 13 withthe sleeve i aforesaid. Such clamp is arranged within the annular cavity6 aforesaid at substantially right angles to the aforesaid companionclamp and is adapted to engage the other end of the curved fuse of thepresent invention. 1 1 is a clamping-screw passing through saidplate-shaped jaws of the clamp 12 and adapted to clamp the jaws thereoffirmly upon the curved fuse aforesaid.

15 is a vertical groove in the vertical wall of the annular cavity 6,adapted to form a guide for the end of the movable jaw of the clamp 12,as shown, so as to maintain the same in proper relation with the fixedjaw of such clamp.

16 is the fuse-piece of the present invention, formed of an open ring orloop shape, as more particularly shown in Fig. 3, and which is adaptedto afford a maximum length of fuse with a minimum diameter of theholding-plug therefor.

17 is an inclosing cap-piece, the lower end or skirt of which is formedwith screw-threads and adapted to screw upon the upper end of the base 1to form an inclosure for the parts arranged in the upper part of saidbase, as heretofore described.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, is

A device of the class described, comprising a cylindricalinsulating-base having a metal sleeve on one end and having its oppositeend diametrically enlarged, provided with a central cavity open on oneside and an annular cavity surrounding the same and provided in itsouter wall with a recess 15, a cap detachably secured on the enlargedend of the base and forming a closure therefor, a conductor 11 in acentral bore of the base, having its inner end in the central cavity andits outer end forming an electrical terminal 5, clamp-plates connectedto the inner end of the said conductor, having their inner ends disposedin the central cavity, said clamp-plates extend-

